<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>404 - Page Not Found</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      margin: 0;
      background-color: #f5f5f5;
    }
    .container {
      text-align: center;
      background-color: white;
      padding: 30px;
      border-radius: 8px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
      max-width: 500px;
    }
    h1 {
      color: #d9534f;
      margin-bottom: 20px;
    }
    p {
      margin-bottom: 30px;
      font-size: 18px;
    }
    .btn {
      display: inline-block;
      padding: 10px 20px;
      background-color: #0275d8;
      color: white;
      text-decoration: none;
      border-radius: 4px;
      font-size: 16px;
    }
    .btn:hover {
      background-color: #025aa5;
    }
  </style>
</head>
<body>
<div class="container">
  <h1>404 - Page Not Found</h1>
  <p>抱歉，您请求的页面不存在。</p>
  <a href="/" class="btn">返回首页</a>
</div>
</body>
</html>